ACP MenuMaster RFS Subway, Service Training Manual

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28
Troubleshooting
CONDITION CHECK RESULT CAUSE REMEDY
No microwave
oscillation.
No continuity.
Continuity.
Defective PCB
assembly
Replace PCB
assembly
Disconnect the
wire leads from
relay 3 and check
continuity of relay 3
(Operate the unit)
Abnormal
Normal
Defective high
voltage
transformer.
Replace high
voltage
transformer.
Check high vol-
tage transformer
Normal
Normal
Abnormal
Defective high
voltage diode.
Replace high
voltage diode.
Check high vol-
tage diode
Abnormal
Defective high
voltage capacitor.
Replace high
voltage capacitor.
Check high vol-
tage capacitor
Abnormal
Defective
magnetron.
Replace
magnetron.
Check
magnetron.
Output is full power
when you set lower
power level.
Abnormal.
Disconnect the
wire leads from
relay 3 and check
continuity of relay 3
(Operate the unit)
Defective PCB
assembly.
Replace PCB
assembly.
NOTE : • Make sure the wire leads are in the correct position.
• When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.
• When removing the magnetron, be sure to install the magnetron gasket in the correct position
and in good condition.
TROUBLE 5: No microwave oscillation even though oven lamp and blower motor run.
(Display operates properly)